C Program to check Leap Year or not

C Program To Find Leap Year Or Not

This c program is used to find a year is leap year or not.

Year is leap year if divided by 400 or divided by 4 and not by 100.

Leaf Year Algorithm:

if (year is not divisible by 4) then (it is a not leap year)
else if (year is not divisible by 100) then (it is a leap year)
else if (year is not divisible by 400) then (it is a not leap year)
else (it is a leap year)

C Program Example:

#include<stdio.h>                                                               
                                                                                                                                        
void main()                                                                     
{                                                                               
  int year;                                                                     
                                                                                
  printf("Enter year: ");                                                       
  scanf("%d", &year);                                                           
                                                                                
  if (year%4 != 0)                                                              
    printf("%d is a not leap year.\n", year);                                   
  else if (year%100 != 0)                                                       
    printf("%d is a leap year.\n", year);                                       
  else if (year%400 != 0)                                                       
    printf("%d is a not leap year.\n", year);                                   
  else // Not divisible by 4 and 100 or 400 e.g. 2017, 2018                     
    printf("%d is a leap year.\n", year);                                       
                                                                                
}                                                                                     

$ cc is_leap_year.c 
$ ./a.out 
Enter year: 2000
2000 is a leap year.
$ ./a.out 
Enter year: 2017
2017 is not a leap year.
$ ./a.out 
Enter year: 2016
2016 is a leap year.